The common garden slug is a yellow-grey colour with a bluish-black head and tentacles. Towards the rear end of the slug there is a yellowish stripe in the middle of the back, there are also stripes around the sides of the body.

The common garden slug breeds throughout much of the year and can be a serious pest of gardens as they attack cultivated plants, fruit, tubers and bulbs, which are eaten by means of a rasping tongue known as a radula. They emerge at night, and spend the day in moist places beneath stones, logs and other objects.